ROTAR, I., A. MOLDOVAN, E. CHIRCA, and A. SUTEU. “Mineral Nitrogen Effect Applied to the Lucerne Crop and the Factor Which Co-Operates to His Recover”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Vol. 23, no. 1, Aug. 1993, pp. 119-24, doi:10.15835/nbha231342.